// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
/* Copied from RFC 3174, Licensed under the Internet Society RFC License */

/*
  Modifications:
  - renamed file from "sha1.h" to "rfc_sha1.h"
  - use 'uint32_t' instead of 'int_least16_t'
*/

/*
 *  sha1.h
 *
 *  Description:
 *      This is the header file for code which implements the Secure
 *      Hashing Algorithm 1 as defined in FIPS PUB 180-1 published
 *      April 17, 1995.
 *
 *      Many of the variable names in this code, especially the
 *      single character names, were used because those were the names
 *      used in the publication.
 *
 *      Please read the file sha1.c for more information.
 *
 */
#pragma once

#include <cstdint>

#ifndef _SHA_enum_
#define _SHA_enum_
enum
{
    shaSuccess = 0,
    shaNull,            /* Null pointer parameter */
    shaInputTooLong,    /* input data too long */
    shaStateError       /* called Input after Result */
};
#endif
#define SHA1HashSize 20
/*
 *  This structure will hold context information for the SHA-1
 *  hashing operation
 */
typedef struct SHA1Context
{
    uint32_t Intermediate_Hash[SHA1HashSize/4]; /* Message Digest  */
    uint32_t Length_Low;            /* Message length in bits      */
    uint32_t Length_High;           /* Message length in bits      */
    /* Index into message block array   */
    uint32_t Message_Block_Index;
    uint8_t Message_Block[64];      /* 512-bit message blocks      */
    int Computed;               /* Is the digest computed?         */
    int Corrupted;             /* Is the message digest corrupted? */
} SHA1Context;
/*
 *  Function Prototypes
 */
int SHA1Reset(  SHA1Context *);
int SHA1Input(  SHA1Context *,
              const uint8_t *,
              unsigned int);
int SHA1Result( SHA1Context *,
               uint8_t Message_Digest[SHA1HashSize]);
